Personally, I think if you're a beginner, AND on the budget, might as well drop the idea of the 50mm 1.8 Get the kit lens, it'll do you much more good than the 50mm1.8
50mm1.8 is one of the most bought lenses, and it's also one of the least used lenses as in (% of people using it actively / % of people who bought it).
As a beginner, I doubt you know your own shooting style yet. If you tie yourself down to a single prime lens, to most people it's almost certain death.
As for flash.. forget about the 430, get the Sigma Super DG 500. It's cheap, and it's very good.
If people say get the 50mm 1.8 even though it's slow, noisy but it's dirt cheap, then think about it. The Sigma Super DG 500 is dirt cheap at 375, and it's as good as its $700 counterpart, and it's going to be ALOT more useful than the 50 1.8.